Improved method of giving a rotary motion to the melted iron in casting chilled rolls



. imrnn Sterns PATENT rrrce.

JOHN C. PA-RRY, OF PITTSBURG, PENNSYLVANIA.

IMPROVED METHOD OF GIVING A ROTARY MOTION T0 THE MELTED IRON IN CASTINGCHILLED ROLLS.

Specification,forming part of Letters Patent No. 6,@05, dated October16, 1S49.-

To all whom t may concern:

Be it known that I, JOHN C. PARRY, ofthe city of Pittsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in the Mode of Casting Chilled Rollers and otherMetallic Rollers, Cylinders, or other Similar Castings; and I herebydeclare that the following is an exact description thereof.

My invention consists in an improved method of giving to the meltedmetal as it rises in the mold and chill in which the roller is cast arotary or swirling motion,the effect of lwhich motion is to throw anyforeign matter, slag, or dross, and the light-erparticles of the meltedmetal to the center, so that the heavy and best portions of the iron areat the outside or surface of the roller or other casting.

Those who are acquainted with the mode of casting chilled rollers areaware that the middle part of the roll (that is, all but thecoupling-piece and journal at each end) is cast in a metallic cylinder,called a chill,77 and the couplings and journals are molded in sand inflasks clamped to each end of the chill. A runner or hollow pipe toconduct the melted metal communicates with a gate at the bottom of themold, and the metal rises in the mold as it is poured down the runner;but the natural effect of the metal rising in the chill when no rotarymotion is given it is to throw the worstV parts to the surface. Tocommunicate this rotary motion two plans have been in usenamely,stirring the metal as it rises in the chill, and making the gates (orpipes which admit the metal into the mold) to enter the mold eitherslanting into the bottom or horizontally in the direction of a tangentto the cylinder. For the latter mode a patent was granted to JamesHarley; but the former mode is dangerous and uncertain, and the latteris liable to the objections that if the gates are small enough to givethe requisite swirl they are apt to choke withslag, and that the metalis apt to chill before it gets in the mold, and the force of the metalis weakened, and if the gates are too large the swirl is injured.

In the annexed drawings, which I desire to form a part ot' thisspecication, Figure l represents a chilled roller, a being the main partor roll, b b the journals, and c c the couplings. Fig. 2 represents avertical section through the center of the mold and chill in which thechilled roller is cast, forming an intaglio impression of the roller, cbeing the main part of the roll, b b the journals, and c c the couplings. d is the runner or conductor, @the gate, f the guide-piece, g thechill, the whole of the mold, excepting the chill g, being surroundedwith iiasks (marked h h) and in the usual manner.

Fig. 3 is a horizontal section of the mold through the gate and lowerjournal, representing more plainly the shape and position of theguide-piecef.

Fig. 4 is a vertical section of the lower part of the mold when theroller is cast with a collar, as described in the specification. 't' isthe Vmold for the collar, showing the guidef.

Fig. 5 is a horizontal section of the mold shown in Fig. 4t through theguide and collar, similar parts in the several figures being representedby the same letters.

In my method thev chill and mold and runner or conductor are made asusual, and the runner (marked d) connects with a gate (marked e) whichenters the mold at right angles to the axis of the roll below the mainpart of the roll in the lower journal, b. At the mouth of this gate isiixed a plate of iron, (markedf,) which I call a guide,77 of the widthof the mouth of the gate, which is bent so as to cover the mouth insideof the mold, not closing it, however, but leaving a sufficient openingor channel for the metal to pass in. The metal. receiving an impulse asit passes through the gate in a direct line toward the center or axis ofthe roll, strikes forcibly against the guide, which meets it inside themold, (see Fig. 3,) and causes it to pass off with violence to one side,round the circumference of the mold, thus communicating a complete andforcible swirl to the metal. When the roll is cast, the guidef, being inthe mold, is firmly cast into thejournal of the roll, if it has not beenburned away by the heat of the melted metal, and the projecting portionvby which the guide was attached to the gate is cut off when the journalb is dressed and turned. v

A slight modification of my method thus described may be found better toanswer the end desired, as it obviates the necessity of leaving theguidepiece in the casting. rIhis is effected by giving the melted metala rotary or swirling motion before it enters the chill, as follows:

lnstead of the gate f entering immediately into the mold, it enters atright angles to the axis of the roller into a circular collar (see t,Figs. 4L and 5) molded into the sand, which collar passes allround thejournal b of the roller. The collar is molded with a pattern, as if itwere designed to be a part of the casting.. The communication betweenthis collar and the main mold is not by pipes, but by a narrow openingall round at the upper edge of the collar where it unites with the mold.(See Figs. 4 and 5.) The guide is xed at the mouth of the gate e whereit enters into the collar ,and the metal receiving a violent swirlingmotion in the collar enters through the narrow openin'g at all pointsofthe circumference of the Inold Without losing the swirl. Theconnection between the collar and the journal of the rolls so finethatit is knocked off with ease` (as if it were a gate,) and the journalb is dressed as usual.

The advantages of my invention and improvement are that the swirlingmotion necessary to loe given to the metal to make a good casting isfully accomplished7 Whilev the gates are of sufficient size to preventthe metal getting chilled or the passage choked up7 and the use ofthecollar, by admitting the iron into the mold simultaneously at allpartsof the eircumference7 makes the casting more even and better.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The application of .a guide to the mouth of a gate entering the moldhorizontally in direction at right angles to the axis of the cylinder,for the purpose ot' producing the swirling motion of the iron.

2. In connection with the guide, the use of the collar connecting at allparts of its circumference with the mold, so as to admit the iron in asteady stream at all parts at the same time.

JOHN C, PARRY.

Witnesses:

Jer-1N H. PAGE, WVM. BAKEWELL.

